Interrupting running Python code from another thread

Hi, does anyone know the best way to stop a currently running PyScope.Exec() call. My C# app is multi-threaded and allows users to run scripts, however where there's an infinite loop, new Python calls can be executed but I can't stop the original infinite loop.

Thanks.

See here https://stackoverflow.com/questions/1420957/stopping-embedded-python.

We currently do not expose Py_AddPendingCall, though, but assuming we did (there is PR #692 that uses it), you could probably translate the given example like this:

class Interrupter
{
    public Interrupter()
    {
        _interruptAction = DoInterrupt;
    }

    int DoInterrupt(IntPtr arg)
    {
        Exceptions.SetError(Exceptions.KeyboardInterrupt, "interrupted");
    }

    [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
    delegate int PendingCall(IntPtr arg);
    readonly PendingCall _interruptAction;

    void Interrupt()
    {
        IntPtr func = Marshal.GetFunctionPointerForDelegate(_interruptAction);
        Runtime.Py_AddPendingCall(func, IntPtr.Zero);
    }
}

All Runtime functions are internal, so you will have to work within pythonnet's codebase itself. A PR adding an Interrupt() function on PythonEngine and PyScope would be highly appreciated :)

Many thanks, i'll do that.

Hi, unfortunately I can't get this to work. I basically used the Interrupter class you posted above, but the DoInterrupt() callback never gets invoked.

Any ideas?

Hi filmor, apologies, got it working. Had to change my C# host apps threading model. As a COM/DCOM MTA server the .exe primary thread was not the thread which eventually called PyEval_InitThreads, which is required for the Py_AddPendingCall supplied callback to work.

Thanks again.

Nice, I'll see whether I can prepare a PR that includes this.

@jduncalf

@jduncalf I think this extension should be help https://github.com/amos402/py-xtimeout

anyone would like to submit a PR?

I think this is not a problem that relate to pythonnet, the extension I supplied above can handle this case.
Or you can reference here to make a trace callback when you try to interrupt the work thread.
https://github.com/amos402/py-xtimeout/blob/3f17f5ed050045cd8dc13987ce2abb0187501f88/xtimeout/_xtimeout.cpp#L358-L379
https://github.com/amos402/py-xtimeout/blob/3f17f5ed050045cd8dc13987ce2abb0187501f88/xtimeout/_xtimeout.cpp#L86-L95

@heartacker

@heartacker i have the same requirement of stopping runing code embbed in wpf. if there is any easy way to stop them. tell me thanks

I also meet this situation. Is there any idea to stop running script which embedded in C#?
thanks

I also meet this situation. Is there any idea to stop running script which embedded in C#?
thanks

it seems we have to wait for 3.0.0

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Interrupting running Python code from another thread #766

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Interrupting running Python code from another thread #766

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filmor commented on Nov 6, 2018

jduncalf commented on Nov 6, 2018

jduncalf commented on Nov 7, 2018

jduncalf commented on Nov 7, 2018

filmor commented on Nov 7, 2018

amos402 commented on Nov 23, 2018

den-run-ai commented on Jan 17, 2019

amos402 commented on Jan 17, 2019

heartacker commented on Aug 14, 2020

kerol2r20 commented on Oct 5, 2020

TheCollegedude commented on Nov 17, 2020

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